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EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

The X11 license is similar to the three-clause (new/revised) BSD license, i.e. it's not a copyleft license and about half of it is just boilerplate liability disclaimers that don't really limit how the code may be used.

The X.org license is a slightly modified version of the MIT license, which in turn is based on the BSD license but without the advertising restrictions. BSD, MIT and X.org are all *very* open licenses which basically say "do what you want with the code but don't sue us if it doesn't work".

GPL, on the other hand, is a "copyleft" license which places more restrictions on anyone using the code, particularly the requirement that any changes to the code be made available in source form if you distribute the modified code in any form.

The X.org / MIT / BSD licenses allow relicensing to GPL (which is why X.org-licensed code is allowed in the Linux kernel even though it has not actually *been* relicensed) while the GPL license does *not* allow relicensing to X.org or any similar license. X.org and similar licenses also allow the code to be used in proprietary systems without restriction, while GPL licenses generally do not allow use in proprietary systems unless there are specific exceptions added to the license.